feat: implement Google Photos import functionality and save media items to the database

src/services/DatabaseService.js

@@ -239,6 +239,37 @@ const DatabaseService = {
     }
   },
 
+  /**
+   * Save a normalised media item object to the DB.
+   * Skips duplicates (same user_id + source_id).
+   */
+  saveMediaItem: async (userId, item) => {
+    try {
+      await DatabaseService.ensureDb();
+      if (!userId || !item.source_service) return;
+
+      // Check for existing entry to avoid duplicates
+      if (item.source_id) {
+        const existing = await db.getFirstAsync(
+          'SELECT id FROM media WHERE user_id = ? AND source_id = ?',
+          [userId, item.source_id]
+        );
+        if (existing) return existing.id;
+      }
+
+      const result = await db.runAsync(
+        `INSERT INTO media (user_id, source_service, source_id, title, description, local_path, remote_path, media_type, created_date)
+         VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)`,
+        [userId, item.source_service, item.source_id || null, item.title || null,
+         item.description || null, item.local_path || null, item.remote_path || null,
+         item.media_type || null, item.created_date || null]
+      );
+      return result.lastInsertRowId;
+    } catch (error) {
+      console.error('Error saving media item:', error);
+    }
+  },
+
   getMediaByUser: async (userId) => {
     try {
       await DatabaseService.ensureDb();